ABSTRACT
Comparative microfauna investigations of different types of wastewater treatment plants lead to the recognition of its specific development. Utility of this kind of investigation is greater if ecology of one of the comparative systems is well-known and activated sludge can be regarded as such. 1 Recently, the knowledge concerning rules of growth RBD biocenosis has enlarged, 2 but is still not complete and requires further experiments. Earlier comparative studies of activated sludge and RBD microfauna were mainly qualitative. 3 Trials of carrying out quantitative analogies probably encountered limitations in the methodolgy. RBD microfauna is not distributed within the whole volume of the film but mainly in the thin, oxygen layer which is technically impossible to separate during the time of sample taking. In this case, total film biomass cannot be the base for qualitative comparison with activated sludge.
